Driveshaft length for 69 coronet ?

I have a 69 coronet 4 door beater that I am putting back on the road. The car is equipped with a 318/904 & small (not 8&3/4) rear end. A friend of mine has a stock pile of old driveshafts & I was curious if anyone knew the specific length I would need. Any info would greatly be appreciated !

Maybe the question I should be asking is:

Are there any websites that list the different driveshaft specs that were used in 1969 ?

Someone needs to have access to a 69 shop manual , I have one , but it's at home .

Last line on attached page from parts book
with 8 1/4 axle-------56.83"

Thanks for the info !